Unfortunately you (and of course the wikipedia page) misunderstood the OECD document [1], which says:

"In France, income tax and employer social security contributions combine to account for 82% of the total tax wedge, compared with 77% of the total OECD average tax wedge."

Note how it says "of the total tax wedge" not "of their salary.

The tax wedge itself is 47.2% in 2024 in France. This is indeed high by international standards but nowhere as high as you claimed.

[1] https://www.oecd.org/content/dam/oecd/en/publications/report...